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<?php $string_source = 'blabla[Sun][Sun]blabla[Moon][Moon][Moon]blabla[Sun][Sun][Sun][Sun]blabla[Venus]'; $string_source = preg_replace_callback('/(\[[^[\]]+\])+/', function($matches) { return $matches[1].'['.(strlen($matches[0])/strlen($matches[1])).']'; }, $string_source); var_dump($string_source);
Output for git.master, git.master_jit, rfc.property-hooks
string(59) "blabla[Sun][2]blabla[Moon][3]blabla[Sun][4]blabla[Venus][1]"

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